biden reiterated u.s. opposition to china's new air defense zone as he met with japan's prime minister in tokyo tuesday. china's zone overlaps with one policed already by japan which includes air space over islands in the east china sea claimed by both countries. >> this action has raised regional tensions and increased the risk of accidents and miscalculations. just ahead of the vice president's visit, china's defense ministry said it would continue to enforce the zone and is, quote, fully capable of exercising control. >> biden stopped short of calling on china to revoke the zone. why? >> they're not going to. you know they're not going to. then you look weak. >> jim mcgregor is an author and business man set to take part in economic meetings with the vice president tomorrow. >> how does this conflict over the air defense zone change biden's visit? >> it derails the visit for what it was supposed to be. this was supposed to be about economics. now we have this air defense thing overshadowing it. >> repor